diff --git a/README.md b/README.md
index 375dca9..94a741b 100644
--- a/README.md
+++ b/README.md
@@ -6,5 +6,4 @@ The problem: it hasn't been well tested.
 
 ## Speed is a big problem of the project, especially collision detections, which are very expensive.
 I am not using spatial hashing right now, and i had no time to optimize the code. I'm sorry.
-
-[![Demo Video](https://img.youtube.com/vi/iMB4mmjTIB4/hqdefault.jpg)](https://youtu.be/iMB4mmjTIB4)
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+[![Demo Video](https://img.youtube.com/vi/iPXQfllqsvs/hqdefault.jpg)](https://youtu.be/iPXQfllqsvs)
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